Re: [webcomponents] :unresolved vs :not(:upgraded) (#418)

I went with `:defined` for now since I like that it makes all of the user-facing APIs match. We can definitely change it if people don't like it (feel free to reopen).

Now that we have a precise defined flag, I think there is less of a timing difference than you might imagine. I don't set the flag until after the constructor is completely finished running.

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